Question

我不明白为什么我无法通过以下方法获得任何结果：

    protected async Task<TEntity> GetAsync(string friendlyName, Func<IQueryable<TEntity>, IQueryable<TEntity>> includes = null)
    {
        return await (includes == null
                ? GetAllCurrent()
                : includes(GetAllCurrent()))
            .SingleOrDefaultAsync(e => e.FriendlyName == friendlyName);
    }

在使用SQL Server Profiler进行检查时，我看到以下内容正在执行：

exec sp_executesql N'SELECT [entity].[Id], [entity].[AgroRangeMultiplier], [entity].[AttackRange], [entity].[CastAreaId], [entity].[ClassId], [entity].[CreatedOnUtc], [entity].[CurrentId], [entity].[EffectId], [entity].[EnergyCost], [entity].[FriendlyName], [entity].[MaxVelocity], [entity].[PreAttackDelay], [entity].[Range], [entity].[RarityId], [entity].[StatusEffectId], [entity].[ThemeId], [entity].[TimeInBetweenAttacksSec], [entity].[TimeToReachMaxVelocitySec], [entity].[UnlockedAtRank], [entity].[UpdatedOnUtc], [entity].[VersionComment], [entity].[Id], [entity].[Name_De], [entity].[Name_En], [entity].[Name_Es], [entity].[Name_Fr], [entity].[Name_It], [entity].[Name_Ja], [entity].[Name_Ko], [entity].[Name_Pl], [entity].[Name_Pt], [entity].[Name_Ru], [entity].[Name_Tr], [entity].[Name_Zh], [entity].[Id], [entity].[DescriptionOnCard_De], [entity].[DescriptionOnCard_En], [entity].[DescriptionOnCard_Es], [entity].[DescriptionOnCard_Fr], [entity].[DescriptionOnCard_It], [entity].[DescriptionOnCard_Ja], [entity].[DescriptionOnCard_Ko], 
[entity].[DescriptionOnCard_Pl], [entity].[DescriptionOnCard_Pt], [entity].[DescriptionOnCard_Ru], [entity].[DescriptionOnCard_Tr], [entity].[DescriptionOnCard_Zh], [entity].[Id], [entity].[DescriptionMarkdown_De], 
[entity].[DescriptionMarkdown_En], [entity].[DescriptionMarkdown_Es], [entity].[DescriptionMarkdown_Fr], [entity].[DescriptionMarkdown_It], [entity].[DescriptionMarkdown_Ja], [entity].[DescriptionMarkdown_Ko], 
[entity].[DescriptionMarkdown_Pl], [entity].[DescriptionMarkdown_Pt], [entity].[DescriptionMarkdown_Ru], [entity].[DescriptionMarkdown_Tr], [entity].[DescriptionMarkdown_Zh], [entity.CastArea].[Id], 
[entity.CastArea].[CreatedOnUtc], [entity.CastArea].[CurrentId], [entity.CastArea].[FriendlyName], [entity.CastArea].[UpdatedOnUtc], [entity.CastArea].[VersionComment], [entity.CastArea].[Id], [entity.CastArea].[Name_De], 
[entity.CastArea].[Name_En], [entity.CastArea].[Name_Es], [entity.CastArea].[Name_Fr], [entity.CastArea].[Name_It], [entity.CastArea].[Name_Ja], [entity.CastArea].[Name_Ko], [entity.CastArea].[Name_Pl], 
[entity.CastArea].[Name_Pt], [entity.CastArea].[Name_Ru], [entity.CastArea].[Name_Tr], [entity.CastArea].[Name_Zh], [entity.StatusEffect].[Id], [entity.StatusEffect].[CreatedOnUtc], [entity.StatusEffect].[CurrentId], 
[entity.StatusEffect].[FriendlyName], [entity.StatusEffect].[UpdatedOnUtc], [entity.StatusEffect].[VersionComment], [entity.StatusEffect].[Id], [entity.StatusEffect].[Name_De], [entity.StatusEffect].[Name_En], 
[entity.StatusEffect].[Name_Es], [entity.StatusEffect].[Name_Fr], [entity.StatusEffect].[Name_It], [entity.StatusEffect].[Name_Ja], [entity.StatusEffect].[Name_Ko], [entity.StatusEffect].[Name_Pl], 
[entity.StatusEffect].[Name_Pt], [entity.StatusEffect].[Name_Ru], [entity.StatusEffect].[Name_Tr], [entity.StatusEffect].[Name_Zh], [entity.Effect].[Id], [entity.Effect].[CreatedOnUtc], [entity.Effect].[CurrentId], 
[entity.Effect].[FriendlyName], [entity.Effect].[UpdatedOnUtc], [entity.Effect].[VersionComment], [entity.Effect].[Id], [entity.Effect].[Name_De], [entity.Effect].[Name_En], [entity.Effect].[Name_Es], [entity.Effect].[Name_Fr], [entity.Effect].[Name_It], [entity.Effect].[Name_Ja], [entity.Effect].[Name_Ko], [entity.Effect].[Name_Pl], [entity.Effect].[Name_Pt], [entity.Effect].[Name_Ru], [entity.Effect].[Name_Tr], [entity.Effect].[Name_Zh], [entity.Class].[Id], [entity.Class].[CreatedOnUtc], [entity.Class].[CurrentId], [entity.Class].[FriendlyName], [entity.Class].[UpdatedOnUtc], [entity.Class].[VersionComment], [entity.Class].[Id], [entity.Class].[Name_De], [entity.Class].[Name_En], [entity.Class].[Name_Es], [entity.Class].[Name_Fr], [entity.Class].[Name_It], [entity.Class].[Name_Ja], [entity.Class].[Name_Ko], [entity.Class].[Name_Pl], [entity.Class].[Name_Pt], [entity.Class].[Name_Ru], [entity.Class].[Name_Tr], [entity.Class].[Name_Zh], [entity.Rarity].[Id], [entity.Rarity].[CreatedOnUtc], [entity.Rarity].[CurrentId], [entity.Rarity].[FriendlyName], [entity.Rarity].[UpdatedOnUtc], [entity.Rarity].[VersionComment], [entity.Rarity].[Id], [entity.Rarity].[Name_De], [entity.Rarity].[Name_En], [entity.Rarity].[Name_Es], [entity.Rarity].[Name_Fr], [entity.Rarity].[Name_It], 
[entity.Rarity].[Name_Ja], [entity.Rarity].[Name_Ko], [entity.Rarity].[Name_Pl], [entity.Rarity].[Name_Pt], [entity.Rarity].[Name_Ru], [entity.Rarity].[Name_Tr], [entity.Rarity].[Name_Zh], [entity.Theme].[Id], [entity.Theme].[CreatedOnUtc], [entity.Theme].[CurrentId], [entity.Theme].[FriendlyName], [entity.Theme].[UpdatedOnUtc], [entity.Theme].[VersionComment], [entity.Theme].[Id], [entity.Theme].[Name_De], [entity.Theme].[Name_En], [entity.Theme].[Name_Es], [entity.Theme].[Name_Fr], [entity.Theme].[Name_It], [entity.Theme].[Name_Ja], [entity.Theme].[Name_Ko], [entity.Theme].[Name_Pl], [entity.Theme].[Name_Pt], [entity.Theme].[Name_Ru], [entity.Theme].[Name_Tr], [entity.Theme].[Name_Zh]
FROM [Card] AS [entity]
INNER JOIN [CardCastArea] AS [entity.CastArea] ON [entity].[CastAreaId] = [entity.CastArea].[Id]
LEFT JOIN [CardStatusEffect] AS [entity.StatusEffect] ON [entity].[StatusEffectId] = [entity.StatusEffect].[Id]
LEFT JOIN [CardEffect] AS [entity.Effect] ON [entity].[EffectId] = [entity.Effect].[Id]
INNER JOIN [CardClass] AS [entity.Class] ON [entity].[ClassId] = [entity.Class].[Id]
INNER JOIN [Rarity] AS [entity.Rarity] ON [entity].[RarityId] = [entity.Rarity].[Id]
INNER JOIN [CardTheme] AS [entity.Theme] ON [entity].[ThemeId] = [entity.Theme].[Id]
WHERE [entity].[FriendlyName] = @__friendlyName_0
ORDER BY [entity].[Id]',N'@__friendlyName_0 nvarchar(450)',@__friendlyName_0=N'stanofmanymoons'

请注意，过滤是在数据库级使用WHERE [entity].[FriendlyName] = @__friendlyName_0

完成的

如果我用正确的骆驼套传递了FriendlyName，则返回的值是正确的。

在SSMS中执行sql语句时，我会得到所需的值，但这不是EF返回的值：

790992AD-D8CE-4ECB-B552-B4BDA5BCDD75    3.33    0.6 E7CCBCBD-024C-4EF0-9126-4F5E62E83A5F    7C15DABB-FDDC-44B1-AC6A-6DE268A3DF00    2018-11-13 08:21:44.9400000 790992AD-D8CE-4ECB-B552-B4BDA5BCDD75    134DFCC4-5867-47A3-80A4-4D560452538A    4   StanOfManyMoons 0.675   0   0.6 D4A7E01F-C1BB-431C-8687-B4946345DB29    NULL    4AF29C4A-282A-4FB8-8691-9D44398A97F2    0.5 0.1 5   2018-11-13 08:21:44.9400000 Initial creation by seeder  790992AD-D8CE-4ECB-B552-B4BDA5BCDD75    NULL    Stan of Many Moons  NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    790992AD-D8CE-4ECB-B552-B4BDA5BCDD75    NULL    Charged: Casts a fiery blast at all enemies.    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    790992AD-D8CE-4ECB-B552-B4BDA5BCDD75    NULL    Stan of many Moons is a 4-cost fighter from the Adventure theme who is available at rank 5 that deals damage to all enemy units on the battlefield with his effect. NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    E7CCBCBD-024C-4EF0-9126-4F5E62E83A5F    2018-11-13 08:21:43.7533333 E7CCBCBD-024C-4EF0-9126-4F5E62E83A5F    OwnSide 2018-11-13 08:21:43.7533333 Initial creation by seeder  E7CCBCBD-024C-4EF0-9126-4F5E62E83A5F    NULL    Own Side    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    134DFCC4-5867-47A3-80A4-4D560452538A    2018-11-13 08:21:38.6466667 134DFCC4-5867-47A3-80A4-4D560452538A    Charged 2018-11-13 08:21:38.6466667 Initial creation by seeder  134DFCC4-5867-47A3-80A4-4D560452538A    NULL    Charged NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    7C15DABB-FDDC-44B1-AC6A-6DE268A3DF00    2018-11-13 08:21:37.2100000 7C15DABB-FDDC-44B1-AC6A-6DE268A3DF00    Fighter 2018-11-13 08:21:37.2100000 Initial creation by seeder  7C15DABB-FDDC-44B1-AC6A-6DE268A3DF00    NULL    Fighter NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    D4A7E01F-C1BB-431C-8687-B4946345DB29    2018-11-13 08:21:36.9700000 D4A7E01F-C1BB-431C-8687-B4946345DB29    Legendary   2018-11-13 08:21:36.9700000 Initial creation by seeder  D4A7E01F-C1BB-431C-8687-B4946345DB29    NULL    Legendary   NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    4AF29C4A-282A-4FB8-8691-9D44398A97F2    2018-11-13 08:21:41.2266667 4AF29C4A-282A-4FB8-8691-9D44398A97F2    Adventure   2018-11-13 08:21:41.2266667 Initial creation by seeder  4AF29C4A-282A-4FB8-8691-9D44398A97F2    NULL    Adventure   NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL    NULL

如果我将代码修改为：

.SingleOrDefaultAsync(e => string.Equals(e.FriendlyName, friendlyName, StringComparison.InvariantCultureIgnoreCase))

该方法返回的结果是正确的，但是所有实体都已装入并且SingleOrDefault正在内存中完成（我绝对要避免）。

数据库的排序规则不区分大小写（SQL_Latin1_General_CP1_CI_AS）。

现在有问题：
-如何在执行数据库级过滤（WHERE子句）时使该查询不区分大小写
-为什么我的代码不起作用？似乎生成的SQL查询是正确的，但是EF在内存中执行了附加过滤，并在其中应用了区分大小写的比较。

不区分大小写的搜索不返回结果

0 个答案: